The probe is separate from the charges Tekashi 6ix9ine, whose real name is Daniel Hernandez, is already facing. In November, federal authorities charged him with a raft of crimes related to alleged gang involvement and illegal firearms possession. Hernandez pleaded not guilty and is currently in jail as his case advances through the courts.

In this new investigation, according to TMZ, authorities are reportedly reviewing a recording from May where Hernandez says he has a “30 pack” on rap rival Chief Keef, whose real name is Keith Cozart. Cozart was the target of a shooting on June 2 in New York after being tailed all night, according to Billboard. At the time, Hernandez denied any involvement in the attempted shooting.

The attempted shooting has gone unsolved by the New York City Police Department and was recently turned over to federal law enforcement, who are reviewing it to see if it will result in additional charges for Hernandez, according to TMZ.